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The Editor-in-Chief and the publisher have retracted this article. The article was submitted to be part of a guest-edited issue. An investigation by the publisher found a number of articles, including this one, with a number of concerns, including but not limited to compromised editorial handling and peer review process, inappropriate or irrelevant references or not being in scope of the journal or guest-edited issue. Based on the investigation's findings the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article.

The authors Devarajan Alagarasan, A. Harikrishnan, M. Surendiran, Karuppusamy Indira disagree with this retraction. The authors Amany Salah Khalifa and Basem H. Elesawy have not responded to correspondence regarding this retraction. The online version of this article contains the full text of the retracted article as Supplementary Information.